(19)
(11) EP 0 145 319 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.12.1986 Bulletin 1986/52

(43) Date of publication A2:
19.06.1985 Bulletin 1985/25

(21) Application number: 84307878

(22) Date of filing: 14.11.1984
(84) Designated Contracting States:
AT BE CH DE FR GB IT LI NL SE

(30) Priority: 14.11.1983 US 551278

(71) Applicant: TANDEM COMPUTERS INCORPORATED
 ()

(72) Inventor:
  • William, Robert Goodman
     ()

   


(54) Input/output multiplexer-demultiplexer communications channel


(57) @ The disclosure relates to an input-output multiplexer demultiplexer communication channel which transfers data between a communications controller and a multiplicity of radially attached communications ports. Self-clocking serial bitsynchronous data is transferred on two opposing unidirectional data links between the communications controller and the communications channel. Serial bitsynchronous data is transferred between the communications channel and the communications ports. The communications channel uses one-bit-time-response roundrobin polling when the communications channel initiates transmissions from the communications ports. Data transmissions from the communications controller are multiplexed on-the-fly in the communications channel to one of the communications ports.






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